Breaker plate



may '13 1924. 1,494,302 s. w. BORTQN BREAKER PLATE Filed AUE. 5; 1921 Patented May 13, 1924.

UNITED STATES PATENT OFFICE.

GEORGE W. BOR'I'ON, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO PENNSYL- VANIA CRUSHER COMPANY, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK.

BREAKER I'LATE.

Application filed August 3, 1921. Serial No. 489,568.

To all whom it may concern:

Be it known that I, Gnonen W. BURTON, a citizen of the United States, residing in Philadelphia, Pennsylvania, have invented Breaker Plates, of which the following is a specification.

My invention relates to machines for crushing stone, coal and the like, and more particularly to improvements in single roll crushers, one object of said invention being to provide means for reducing the amount of over-size product, including slabs and spawls, which otherwise would pass over the lower end of the breaker plate without further reduction.

In the attached drawings,

Fig. 1 is a vertical section of sufiicient of a single roll crusher to illustrate one embodiment of my invention;

Figs. 2 and 3 are sections of the breaker plate and its renewable tip, illustrating modifications within the scope of my invention; and

Fig. 4 is a perspective view of the perforIa ted breaker plate extension illustrated in i 3.

In l ihe above drawings, I have illustrated a machine having a rotary crusher roll 1 and a breaker plate 2 provided with a renewable tip 3. Said breaker plate is resiliently retained adjacent the said crusher roll by means of rods 4 attached one to each side thereof and springs 5 confined in each case between a collar 6 upon one of the rods and a fixed portion 7 of the frame of the machine, this arrangement by reason of the springs 5 permitting to a limited degree movement of the breaker plate relatively to the crusher roll.

It has hitherto been the practice in crushers of this type to so dispose the breaker plate relative to the roll that its lower end or tip extends no further than, and usually stops short of, the straight line a"w drawn through the center line of the roll and the axis of the cylinder whose surface includes the inner face of the breaker plate tip, as illustrated in Fig. 1. Since the point of nearest approach of the two non-concentric surfaces defined bv the surface of the drum and the inner face of the breaker plate will necessarily lie upon this theoretical line 00-00, the breaker plate must approach from top to bottom, continually nearer the surface of the crusher roll. With this arrangement, however, there is unavoidably a large percentage of over-size product which passes unbroken oil the end of the breaker plate.

I have discovered that by extending the breaker plate beyond the, said line aa-ac, preferably in such manner that the other end of said extension portion approaches continually nearer to the roll, in the manner of the rest of the breaker plate, or if desired, extends parallel with the surface of said roll, I am able to greatly reduce the amount of slabs, spawls and other over-size materials which otherwise pass off the end of the plate. The said extension may have a plane surface or may be corrugated or otherwise roughened, and may be slotted or otherwise perforated without departing from my invention. It will further be understood that it is immaterial whether the extension forms an integral part of the breaker plate, a part of a removable tip attached to said plate, or is in itself an independent attachment to the plate. In Fig. 1, the extension piece 8 is shown as an integral part of the renewable tip 3, adapted to be secured to the breaker plate 2 by suitable bolts 9 and 10. In Figs. 2 and 3, the removable tips 3 and 3 are secured to the breaker plate 2 by bolts 9 and 9" respectively, while the removable extension pieces 8 and 8 are secured to the extended end of the breaker plate 2 by suitable fastening bolts 11 and 12 respectively.

In operation, the reduction of the material progresses gradually from the top of the hopper to the point of discharge from the outer end of the breaker plate and when said material reaches the perforated or slottedextension piece 8, it will be agitated between the surface of the rapidly revolving roll and the surface of the extension piece, with the result that it is broken by the crushing action set up between these parts. Furthermore, the extension piece 8, being comparatively close to the roll, gives additional opportunity for breaking down the oversize material which has reached this point and before it is expelled from the end of the breaker plate.

The slots or perforations in said piece 8 cause the latter to act as a grid whose bars offer resistance to the forward travel of the material and thereby eifect a greater breaking up of the material than if the plate were unperforated. With this object in View, it is desirable to make the apertures in the form of slots, as shown in Fig. land dispose them longitudinally of the plate or parallel to the axis of rotation of-the roll. The said slots-or perforations also'permit the escape of a certain proportion of the crushed material as soon as it is reduced to the desired size, thereby giving the crushing action, of the roll full play upon the remaining material and decreasing the amount of power required to rotate the roll.

I claim:

1. y In a crushing machine, the combination of a crusher roll, a breaker plate disposed adjacent to the periphery of the roll, and a corrugated and perforated extension detachably secured to said breaker plate and extending beyond the breaking plate the direction of rotation of the roll.

2. In a crushing machine, the combination of a crusher roll; a breaker plate disposed adjacent the periphery of the roll; and a breaking tip on said plate, said tip having a portion of its surface corrugated and the remaining portion thereof provided With a plurality of perforations extending through said tip. 7

'3. In a crushing machine, the combination of a crusher roll, a breaker plate disposed adjacent the periphery of the roll, a corrugated breaking tip on said plate near the lower end thereof, and a slotted member on said breaker plate and extending beyond the breaking tip in the direction of rotation of the roll.

4. In a crushing machine, the combination of a crusher roll; a breaker plate disposed adjacent the peripheryof the roll; a removable breaking tip on said plate; and a slotted member, also 'removably attached to the plate, extending beyond the breaking tip in the direction of rotation of the roll.

5. In a crushing machine, the combination of a crusher roll; a breaker plate disposed adjacent the periphery of the roll; and a breaking tip detachably secured to the plate, said tip being provided on its Working surface with corrugations and With a plurality of slots extending in a direction parallel to the axis of rotation of said roll.

GEORGE W. BORTON. 

